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Question

Which one of the following gives the correct categorization of six animals according to the type of nitrogenous wastes (A, B, C), they excrete?

A
A
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B
B
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C
C
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D
D
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Solution

The correct option is C C

On the basis of nitrogenous metabolic wastes, the animals are of four types

(i) An ammonotelic organism excretes nitrogenous waste as soluble ammonia. Most of the aquatic animals including protozoans, crustaceans, platyhelminths, cnidarians, poriferans, echinoderms, fishes, larvae/tadpoles of amphibians are ammonotelic.

(ii) A ureotelic organism excretes excess nitrogen as urea - for example, frog, toad and mammals.
(iii) Uricotelic excrete nitrogen in the form of uric acid – for example, insects, land reptiles and birds.


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